EISCOHigh Power Catapult Kit - Build Yourself - STEM Learning - Comes Explore Force, Acceleration, Hooke's Law & More - Garage Physics

My 11yo ordered and assembled this for our STEM Fair. She had a great time learning about the physics principles behind the catapult action.

I was looking for catapults for my students to experiment with during class. These are perfect. They allow the students to move the pegs and adjust the rubber bands to see what performs the best. However, the arms in all the kits I bought, broke! The rest of the structure is good, but the arms are made of compressed cardboard and all snapped in the same spot. A friend of mine had to make new arms for all of my kits out of real world and now they work great.

Son loves it. Large,solid. However, expensive.

I bought six of these for a training class. Two of them experienced a crack down the lever arm, next to the hole for the lever arm fulcrum point. The lever arm delaminated. There is a little slop between the lever arm and the sides, making for inconsistent shots, but this was ok for our training exercise. Adding a washer on each side of the lever arm kept it in place and made it more accurate.The rest of the catapult is pretty well built and you can expect to get any range from 1' - 15'.

Poor design. The second hole for the fulcrum dowel makes the firing arm bind with the side support so your experimentation options are cut in half. You'll need to trim about 1/4" the firing arm.